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Standard Yarn Weight System

Yarn Weight Standards

Yarn Weight System:

Use this link from Craft Yarn Counsil to help identify Standard yarn weight

Categories of yarn, gauge ranges, and recommended needle and hook sizes

Yarn Weight Symbol
& Category Names
lace super fine fine light medium bulky super bulky jumbo
Type of
Yarns in
Category
Fingering
10-count
crochet
thread
Sock, Fingering, Baby Sport,
Baby
DK,
Light
Worsted
Worsted,
Afghan,
Aran
Chunky,
Craft,
Rug
Super Bulky,
Roving
Jumbo,
Roving
Knit Gauge
Range* in
Stockinette
Stitch to 4 inches
33–40**
sts
27–32
sts
23–26
sts
21–24
sts
16–20
sts
12–15
sts
7–11
sts
6 sts and fewer
Recommended
Needle in
Metric Size
Range
1.5–2.25
mm
2.25—
3.25
mm
3.25—
3.75
mm
3.75—
4.5
mm
4.5—
5.5
mm
5.5—
8
mm
8—
12.75 mm
12.75 mm and larger
Recommended
Needle U.S.
Size Range
000–1 1 to 3 3 to 5 5 to 7 7 to 9 9 to 11 11
to 17
17
and
larger
Crochet Gauge*
Ranges in
Single Crochet
to 4 inch
32–42
double
crochets**
21–32
sts
16–20
sts
12–17
sts
11–14
sts
8–11
sts
7–9
sts
6 sts and fewer
Recommended
Hook in Metric
Size Range
Steel***
1.6–1.4
mm
Regular hook
2.25 mm
2.25—
3.5
mm
3.5—
4.5
mm
4.5—
5.5
mm
5.5—
6.5
mm
6.5—
9
mm
9—
15 mm
15
mm and
larger
Recommended
Hook U.S.
Size Range
Steel***
6, 7, 8
Regular
hook B–1
B–1
to
E–4
E–4
to
7
7
to
I–9
I–9
to
K–10 1⁄2
K–10 1⁄2 to
M–13
M–13
to Q
Q
and
larger
* GUIDELINES ONLY: The above reflect the most commonly used gauges and needle or hook sizes for specific yarn categories.** Lace weight yarns are usually knitted or crocheted on larger needles and hooks to create lacy, openwork patterns. Accordingly, a gauge range is difficult to determine. Always follow the gauge stated in your pattern.*** Steel crochet hooks are sized differently from regular hooks—the higher the number, the smaller the hook, which is the reverse of regular hook sizing
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NM is for …

NM is a yarn count you can see on some European products. It shows how many meters are in 1 kilogram of yarn. Here’s the examples of counts our store has to offer:
NM 4.8/1
1 means that it’s single ply, there’s only one thread not twisted with any other.
4.8 means that there’s 4800 meters in 1 kg (1000 grams), or 2,380 yards/lbs. 
You may still be wondering what that all means and if that’s the yarn you need for your project. 
Here’s the link to the BEST online chart of Yarn Weights and Measures: http://www.spinderellas.com/ It is an awesome way to convert the information you have about the yarn (wpi, yards per pound) into US standard yarn category, and it even recommends hook and needle size. So, based on that chart, NM 4.8/1 will be Fingering weight because it has 2,380 yards per pound and wpi 30.
The higher the NM (26/1, 33/1), the thinner the yarn, looking more like a thread for the finest projects.